<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>按钮练习</title>
    <style>
        *{margin: 0;padding: 0;}
        h5 {
            margin: 100px 50px;
            border: 1px solid #cbcbcb;
            background-color: #f6f6f6;
            width: 92px;
            height: 30px;
            line-height: 30px;
            font-weight: 400;
            text-indent: 1.4em;
            color: #707070;
            background-image: url("img/add.png");
            background-repeat: no-repeat;
            background-position: 4px center;
        }
    </style>
</head>
<body>
    <h5>增加子类</h5>
</body>
</html>